Update for Show/String reform

[renato-zannon]

Fallout from the landing on rust-lang/rust#21457

[SimonSapin]

Result<_, ()> doesn't implement unwrap anymore

Does it really not? rust-lang/rust#21457 says:

The unwrap methods on Result now require Display instead of Debug

[renato-zannon]

Does it really not? rust-lang/rust#21457 says:

The unwrap methods on Result now require Display instead of Debug

Yes, that is the reason it does not - () only implements Debug, not Display. The following program does not compile on rustc 1.0.0-dev (8160fc478 2015-01-22 16:50:17 +0000)

fn main() {
    let res: Result<String, ()> = Err(());
    res.unwrap();
}

error:

foo.rs:3:9: 3:17 error: type `core::result::Result<collections::string::String, ()>` does not implement any method in scope named `unwrap`
foo.rs:3     res.unwrap();
                 ^~~~~~~~
error: aborting due to previous error

[SimonSapin]

Oh, I see. For what it’s worth, there is some discussion in rust-lang/rfcs#565 on reverting that change.

[renato-zannon]

Seems like it will be reverted. Good to know!

I think my first commit is still necessary though. Would you like me to submit another PR?

[SimonSapin]

No need. I’m in the middle of building Rust, since these changes are apparently not in Nightly yet.

[SimonSapin]

Alright, I’ve published v0.2.17 with your first commit. Tests are failing, but I expect this will be resolved when the Result::unwrap change is reverted.

[SimonSapin]

Oops, sorry, I got confused with rust-url.

[tomprogrammer]

The proposed changes in this PR were merged with 97087a8 and published in version 0.2.4